<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        /* 选中当前页面内所有的div标签 */
        div{
            color: red;
        }
        
        span{
            color: orange;
        }
    </style>
</head>
<body>
    <div>标签选择器</div>
    <div>标签选择器</div>
    <div>标签选择器</div>
    <span>能够选中所有同类型的标签</span>
    <span>能够选中所有同类型的标签</span>
</body>
</html>